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Reproductive Biology of Phymaturus Spectabilis (Liolaemidae): Females Skip Reproduction in Cold and Harsh Environments of Patagonia, Argentina

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Reproductive Biology of Phymaturus Spectabilis (Liolaemidae): Females Skip Reproduction in Cold and Harsh Environments of Patagonia, Argentina Herpetological Conservation and Biology 9(1):170–180. Submitted: 10 October 2012; Accepted: 22 January 2014; Published: 13 July 2014. REPRODUCTIVE BIOLOGY OF PHYMATURUS SPECTABILIS (LIOLAEMIDAE): FEMALES SKIP REPRODUCTION IN COLD AND HARSH ENVIRONMENTS OF PATAGONIA, ARGENTINA 1,5 1 2 JORGELINA M. BORETTO , FACUNDO CABEZAS-CARTES ,FABIÁN TAPPARI , FAUSTO 3 4 2 MÉNDEZ-DE LA CRUZ , BARRY SINERVO , ALEJANDRO J. SCOLARO , AND NORA R. 1 IBARGÜENGOYTÍA 1INIBIOMA (CONICET – Universidad Nacional del Comahue). Bariloche, Río Negro, Argentina, e-mail: [email protected]; [email protected] 2Universidad Nacional de la Patagonia, Trelew, Chubut, Argentina, e-mail: [email protected] 3Laboratorio de Herpetología, Instituto de Biología, Universidad Nacional Autónoma de México, D.F. 04510, México, e-mail: [email protected] 4Department of Ecology and Evolutionary Biology, Earth and Marine Sciences Building, University of California, Santa Cruz, California 95064, USA, e-mail: [email protected] Abstract.—Herein, we describe the reproductive biology of Phymaturus spectabilis, a lizard species that inhabits rocky outcrops in cold and arid environments of the Patagonian steppe of Argentina. We studied male and female reproductive cycles, mean annual reproductive output, allometric changes during ontogeny, and sexual dimorphism, mainly with a non-invasive methodology used for the first time in Argentina. We corroborated results from this non-invasive method with data from euthanized individuals through observation, classification, and measurement of the female reproductive tract and ovaries and through examination of the histology of testicles and epididymis in males. The presence of males with spermatozoa in the epididymis from early spring and gravid females from mid spring shows that mating, ovulation, and egg development occur at the beginning of the activity season. Parturition occurs in midsummer to two offspring. Our finding that half of the adult females were in a non-reproductive condition during the entire reproductive season, simultaneously with vitellogenic or gravid females, demonstrates that not all of the adult females in this population reproduce every year. Females exhibited an annual to biennial cycle, sometimes skipping a year of reproduction, while males exhibited an annual cycle. Phymaturus spectabilis show the common pattern of low mean annual reproductive output found in the genus Phymaturus. The low frequency of reproduction and the low mean annual reproductive output are risk factors for this species. These life-history traits, together with its microendemic character (as it is restricted to an area of 70 km2 of fragmented and rocky plateaus in the poorly protected steppe of Patagonia Argentina), mean that this species is of concern. Key Words.—abdominal palpation; cold and harsh steppe; lizards; reproduction INTRODUCTION under study that may represent new species (Lobo et al. 2012; Morando et al. 2013). However, the Reproductive biology studies are essential for reproductive biology of the majority of these species is understanding the life history of a species and have a unknown. direct relevance for conservation. This is especially Species of the genus Phymaturus show features true in the lizards of the Phymaturus genus conserved from the ancestral state, such as their (Liolaemidae). Although the reproductive biology of consistent preference for rocky microhabitats, a only six Phymaturus species has been studied, their mainly herbivorous diet, and a viviparous reproductive reproductive characteristics and low mean annual mode (Cei 1986, 1993; Scolaro and Ibargüengoytía reproductive output, together with characteristics of 2008). The cold and harsh environmental conditions their ecology and distribution, make them vulnerable restrict the activity of Phymaturus lizards to a limited (Abdala et al. 2012). In addition, while the genus period from spring to autumn. They spend the rest of Phymaturus is widely distributed in the cold and harsh the year in dormancy in rock crevices like other environments on both sides of the Andean Highlands Liolaemids lizards from Patagonia Argentina, such as (Argentina and Chile) and in the arid Patagonian Liolaemus elongatus (Ibargüengoytía and Cussac Argentinean steppe (Cei 1986, 1993), individual 1998; 1999), Liolaemus pictus (Ibargüengoytía and species have a very restricted distribution and this Cussac 1996; 1999), Liolaemus bibronii, Liolaemus genus exhibits significant microendemisms (Abdala et boulengeri, and Liolaemus lineomaculatus (Medina al. 2012). In the last 30 years, the number of known and Ibargüengoytía 2010). Most species of Phymaturus species has increased from 10 to 41 Phymaturus studied complete a female reproductive (Núñez et al. 2010; Troncoso-Palacios and Lobo 2012; cycle in two years (P. vociferator: Habit and Ortiz Lobo et al. 2013; Scolaro et al. 2013; Abdala and 1996; P. tenebrosus: Ibargüengoytía 2004; P. Quinteros 2014), and there are another 31 populations antofagastensis: Boretto and Ibargüengoytía 2006; P. 170 Herpetological Conservation and Biology punae: Boretto et al. 2007; P. cf. palluma: Cabezas- precloacal pores in males), and measured each Cartes et al. 2010). The only exception occurs in specimen (digital gauge ± 0.02 mm, CA-01, Lee Phymaturus zapalensis females, which can reproduce Tools, Guangzhou, Guangdong, China) to study the annually but occasionally skip a year of reproduction allometric changes during ontogeny and sexual and therefore have an annual-biennial cycle (Boretto dimorphism. From the total sample of 178 lizards, we and Ibargüengoytía 2009). The cold harsh classified by abdominal palpation according to the environments that Phymaturus lizards inhabit, together reproductive state (see further explanation below) a with the physiological inability of viviparous females subsample of 151 individuals captured during the field to perform vitellogenesis while gravid (Duvall et al. trips of December 2010 and February-March 2011. 1982; Callard et al. 1992; Custodia-Lora and Callard We used GPS data (3 m resolution) to release most 2002), restrict the time available to complete a female lizards at their capture sites immediately following reproductive cycle in one year. Males of Phymaturus measure and palpation. Two groups of lizards were species have developed different ways of adapting to not immediately released. The first group consisted of female cycles such as prenuptial, postnuptial, or 12 gravid females that were transported to the continuous spermatogenic cycles. In species with laboratory until parturition (see further explanation prenuptial cycles, males perform spermatogenesis below), after which they were released at their original from spring to mid-summer, in synchrony with the capture sites. The second group consisted of the other follicular development and ovulation of females (P. 27 lizards of the total sample (17 males and 10 vociferator, Habit and Ortiz 1996; P. punae, Boretto et females). We brought these lizards to the laboratory, al. 2007). Postnuptial cycles are characterized by the where they were euthanized by intraperitoneal temporal dissociation between spermatogenesis and administration of sodium thiopental anesthetics. They mating, in which spermatogenesis lasts almost a year were then fixed in Bouin's solution 24 h and preserved from summer, autumn, and winter before resuming the in 70% ethanol to be used to study the spermatogenic following spring, when mating and ovulation occur (P. stages in males and to corroborate the reproductive tenebrosus: Ibargüengoytía 2004; P. zapalensis: state determined by palpation. For this work, we Boretto and Ibargüengoytía 2009; Boretto et al. 2012). followed the ASIH/HL/SSAR Guidelines for Use of Males with continuous spermatogenic cycles exhibit Live Amphibians and Reptiles as well as the sperm availability along the entire activity season from regulations detailed in Argentinean National Law spring to autumn (P. antofagastensis: Boretto and #14346. We deposited the specimens in the collection Ibargüengoytía 2006; Boretto et al. 2010; P. cf. of the Centro Regional Universitario Bariloche of the palluma: Cabezas-Cartes et al. 2010). Universidad Nacional del Comahue. In this study, we examined the reproductive cycles Phymaturus spectabilis habitat is located in the of males and females, minimum adult size, clutch size, Geomorphologic Region of Endorheic Depressions, in allometric changes during ontogeny, and sexual the arid district of the Monte Austral (Godagnone and dimorphism of Phymaturus spectabilis. This species Bran 2009). The dominant landscape is characterized is a microendemic to an area of approximately 70 km2 by barren steppe and dissected rolling plains in a volcanic rocky plateau at 1,000 m elevation, close interspersed with rocky outcrops and vegetation of a to Ingeniero Jacobacci, in the south-western area of shrub-steppe grassy appearance (Cabrera 1971; the Río Negro Province, Patagonia Argentina (Lobo Godagnone and Bran 2009). There is low herbaceous and Quinteros 2005; Pincheira-Donoso et al. 2008). In coverage, composed of sparse cushion bushes (Stipa addition, we show the accuracy of the non-invasive papposa, S. speciosa, S. humilis, Poa ligularis, and technique of abdominal palpation to determine the Bromus catharticus), and subshrubs (Senecio reproductive stage of adult females in this species with filaginoides, Nassauvia glomerulosa, and Grindelia the objective of promoting the use of non-invasive chiloensis) with bare
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